Add exec command

tools/assetstool/processasset.py

@@ -2,6 +2,7 @@ import sys
 # from processtileset import processTileset
 from processimage import processImage
 from processpalette import processPalette
+from processconfig import processConfig
 
 processedAssets = []
 
@@ -17,6 +18,8 @@ def processAsset(asset):
     return processPalette(asset)
   elif t == 'image':
     return processImage(asset)
+  elif t == 'config':
+    return processConfig(asset)
   # elif t == 'tileset':
   #   return processTileset(asset)
   else: